The stadium sits atop a hill overlooking the city. A statue of a Dragonite, the guardian of Pummelo Island, is situated at the top of the stadium. It is a Colosseum with lights and a scoreboard, its size rivaling even the stadium where the Indigo Plateau Conference is held. In the Winner's Cup Competition, whenever three of either Trainer's Pokémon are unable to battle, the field is changed.
Pummelo Stadium first appeared in a flashback in A Shipful of Shivers, when a Haunter created an illusion of its Trainer, the Captain, winning the Orange League three hundred years before, using his Gastly against another Trainer's Beedrill.
Ditto was Drake's first Pokémon used against Ash. With its Transform, it was able to completely mimic Pikachu and match all of its attacks. However, in the end, Pikachu was able to outpace Ditto due to Ditto's physical condition remaining the same despite its transformation. It was defeated after Pikachu managed to stand up and knock Ditto to the ground with its tail after a prolonged race using Agility.
Onix was Ash's second opponent. Squirtle started the battle with a Water Gun, but Onix dodged it using Dig. Ash then decided to send Squirtle into the water only to be stopped a couple of feet shy by Onix emerging from underground which knocked Squirtle into the air before using Bind. Squirtle escaped Bind by using Hydro Pump. After using a Skull Bash on the now weak Onix, Ash's Squirtle won the battle.
Drake's third Pokémon against Ash was Gengar. Ash initially sent out Tauros, but after a failed attempt at Fissure which allowed Gengar to counter with Confuse Ray, Ash then switched for Lapras. Lapras avoided a Hypnosis attack by diving underwater where upon surfacing both Lapras and Gengar launched their respective Ice Beam and Night Shade attacks simultaneously which resulted in a massive explosion knocking out both Pokémon.
Venusaur was Drake's fourth Pokémon, which faced off against Ash's Tauros. Tauros's Fissure didn't work due to the sand field's cushioning effect. However, after surviving Venusaur's Solar Beam, Tauros was able to defeat Venusaur with a Take Down attack.
Pummelo Stadium appeared in The Orange Crew Supreme Gym Leader and Pikachu's Plan, where Ash challenged Drake after earning all four Orange League Gym Badges. After defeating Drake's Ditto with his Pikachu, Ash proceeded to defeat four other members of his team, forcing Drake to use his strongest Pokémon, Dragonite. The Dragon Pokémon proceeded to easily defeat Ash's Squirtle, and eventually also Ash's Charizard. However, Pikachu was able to defeat it by using Thunder inside its mouth, earning Ash the title of the Orange League Champion.